I'm having trouble adding photos because if size I think? I don't have a desk top and I view and read. Post etc from my android phone. I cant figure a way to resize. Dont know how to right click from phone and I csnt seem to change size from phone camera. Not to mention I'm a technical idiot. Any help appreciated

On Android phone:
1. Select image you want to resize.
2 click on edit tool
3.when picture comes up in editor look in top right of screen and click on dots.
4. Select resize image and save

What app are you using for that? Google Photos doesn't have an edit option for resizing.