Hi Mindi,
You're welcome.
The browser is the app you use to access the Internet (and hence this website). It could be Safari, Chrome, Firefox or something else.
When you post in the forum, at the bottom of the text box you should see a button labelled "Upload an image". If you tap this on your phone, it will probably ask you how you want to complete the action. Usually there's something like "Gallery", "Documents" or "File Browser/Manager" as an option. Most, if not all, of these should allow you to select a photo to upload.
