How to get back off of Disney Minnie Mouse kids watch

You need a watch back press if it is push on, or a back removal tool if it is a screw back..

https://www.fixya.com/support/r27181038-changing_watch_batteries

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The simplest solution to this is to get a watch repairer to do it for you. They usually only charge a small fee to do it and just takes a few minutes.
If you can get the back cover off the watch the battery will have a size code marked on top of it, often an AG- or an SR- number. This will give you the size of battery you need. I think your watch has a 'push fit' back plate.
*Note* If your using something metal as a lever it could scratch the watch.
CAREFULLY using a blunt edged lever GENTLY lever the back plate off. This should reveal the battery. When refitting the back plate it should click into place using a firm, even and gentle pressure.

Amazon.com: Customer Questions & Answers

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Amazon.com, Inc.Disney Kids' FZN3630 Frozen Anna and Elsa Watch With Graphic Band. by Disney ... Question: i have no directions for setting the time either in or on the pkg.Missing: accutime ‎lr626

Disney Kids' FZN3630 Frozen Anna and Elsa Watch With ...

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Rating: 4.2 - ‎68 reviews
The digital time makes it easy for kid's to read. It light's up when you push it. The Frozen theme is adorable. This watch does not look cheap at all. It will adjust to ...

Yes, you can solve your watch problem from ankaka . It is a great place of digital watch as well as many electronic products. Different modern types of digital watch and solution in case of problems are available here.
http://www.ankaka.com/Wholesale-led-watches_c10091

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They give a generic how to use the watch inside the back face plate, sorry That's all I got.

mcdevito75 here, Any small watch repair shop can replace the strap for you. Ebay may have Mickey Mouse replacement straps if you"d like a Mickey Mouse strap.

whats the issue?

mcdevito75 here, hello miss d, the first Mickey watch Disney came out with was in 1933, Mickey was invented in 1928, if this is a picture of your Mickey above, then it wa made in the early 1980"s. If it's working very well it could be worth a collector value of approx. $30.00 --$50.00

Your Best Bet is to shop ebay and compare your Mickey watch with others listed on ebay.