How to pick up the phone when 2person call in a same time?

Follow the instructions on page 9 of this manual.

Have you tried erasing all the (incoming) messages on the machine? Does that let it ring the full 4-ring-cycle before it picks up?

It's been years since I owned one of these, but there should be a switch (on the side of the unit?) for a feature called "toll saver" If you find this, switch it off.

The idea was from the days of payphones -- if the machine had no messages, it would ring 4 times before it picks up. If there were messages, it would pick up after one ring (or sometimes two)

If you were out on the town and wanted to check your messages, you'd put your dime in a payphone and call home. If it rang three times, you can hang up the payphone and get your dime back, knowing there's no message to check.

get more lines.
Or check Auto line select.

From ext 10 or 11:
press feature 00
press left intercom twice
press right intercom once
enter extension number
press **
then press the lines in the order you want them picked up (line 5, 4, 3, 2, 1 then the intercom )
press**
press feature 00 to exit programming.

When the extension picks, it will pick up line 5. If 5 is busy, it will pick up line 4 , etc....

Sounds like you have several issues here...Time & date is set by entering the DB Administrator, then using the code 08-14. Feature69 defaults a set, not the time. The incoming display is normal, as you are a member of the first UCD group. When you pick up the phone, it shows ICM because you are in intercom mode. There are 3 different ITCM modes: green, red, blank. Your extension button lights red because it's an indicator that you are on the phone.

get the first one and second one and talk at one time

You can use an handset lifter accessory, such as the HL1 or HL10 to pick up the handset every time you need to use the headset.

how do i turn ringer on

callers maybe calling you and than pressing 1 to voice call you. Dialing your extensions than 1.
Pick up the handset before pressing speaker.

The flash time is set too short to activate the call waiting. You'll need to make it longer. Try the following to change the flash time.

1. Press the MENU button while in standby mode.
2. Use the < REVIEW > button to scroll to SET PHONE OPTIONS.
3. Press the SELECT/SAVE button.
4. Use the < REVIEW > button to scroll to SET FLASH TIME.
5. Press the SELECT/SAVE button.
6. Use the < REVIEW > button to scroll through the flash time options. You may choose 100ms or 600ms.
7. Press the SELECT/SAVE button to save.

setting the flash time to 500ms should get it working right.

If this help, please rate my advice. Thanks, and good luck!!

Sounds like phone line issue to me like noise on it at times did your phone provider check it?