My platinum 955e is sewing in reverse and I can't get it to go forward

You would need to contact the manufacturer of the product for the compatibility question.

Are you using buttons on a footswitch or on the machine? If a footswitch, check to be sure the switch's cord is not plugged in upside-down. You might have to open it up and swap wires to the switches.

The Platinum 955E uses "d" cards for the embroidery function. You can find "d" cards on some of the auction sites. The machines is about 10-15 years old.

here is a link for a manual for the machine, hopefully the information you need is in it
http://www.sewingpartsonline.com/instruction-manual-husqvarna-viking-775-and-955e.aspx

Maybe there's a problem with the reverse and forward button.

For sewing machine reviews

You need to take the machine in for adjustment, on that model you cannot do it yourself

If it has been a very long time since the machine has been serviced by a HV tech, it is a possible there is a build up of old lubricant and dust gumming up the gears.

Although, you may be able to loosen the gunk by warming the area with a hair dryer, it would be best to take the machine in to an authorized HV dealer for service.

Does the length on the display change or is it as if the buttons are not even working. If the touch pad is malfunctioning you will probably find other buttons not working. Try all of the buttons and see if others do not work. If this is the case, the keypad can be replaced.

Welcome to FixYa. Hi - Viking has online tutorials for several of the 955E features, including embroidery.
Here is a link to the 955E tutorials:
http://www.husqvarnaviking.com/us/6616_393.htm

Some general hints and tips: 

• Always turn your machine off when you attach or remove your embroidery arm or when you  insert or remove an embroidery design card.
• When you insert your embroidery arm, insert an embroidery design card. When you turn your machine back on, you should see a message on the info screen that says something like "embroidery arm will move". Press OK, and the embroidery arm will calibrate. 
• After the embroidery arm has calibrated, place your hoop on the embroidery arm. 
• Look at each end of your embroidery arm - you will find a connector that must slip into a corresponding connector on the embroidery machine. This connector slides into a corresponding connector on the machine. The connector on the machine has a cover that slides open and closed. If it is closed, it you might not spot it right away. You must open this slot when you attach the embroidery arm - slide the embroidery arm straight back (not at an angle), so the embroidery arm connects to the machine securely. Although you might need to nudge the embroidery arm in place, do not force it! 

The Viking site also has projects for the 955E that will help you learn to use some of the features - you can probably sew most or all of the free projects on the site, but projects for the 955E incorporate features on your machine that might be available on others. And look for the free designs!
Hope this helps get you started.  If you and other readers have a minute to rate this information (good or bad, or indifferent), your rating will help me determine if I understood your question and if my answer is helpful.
A few more recommendations...You can order a manual for your machine from any Viking dealer and probably online, and I recommend that you do. Your machine has some very cool sewing and embroidery features. I sold Vikings, so I can answer specific questions about many individual features, but Viking manuals are not expensive and can help you save time and avoid irritating problems.

If you have more questions, please comment and I will do my best to help you further. I am pleased to answer general questions about embroidery, if you want hints and tips or run into problems.

Cheers, Ginny