Need help fixing a bug and adding features in a completed corona project

So, basically I am looking for anyone who can fix a small bug in my completed corona project. 

I have a fun drawing app. The IOS version works great and is already published. However, The android version has an issue with a button not showing after i go back to the main menu and i am not sure why? Also, I would like some other features added to app like an undo button, and different brush types. Anyways if you are interested and could possibly give a quote that would be amazing Thank you. screen shots below. I will show code when/if its needed. 

Thanks,

Andrew

Have a look on my app.

https://play.google.com/store/apps/details?id=com.Onemln.PeterColoringBook&hl=en

Have a look on my app.

https://play.google.com/store/apps/details?id=com.Onemln.PeterColoringBook&hl=en