Hi CJ,
You have a couple possibilities. One is to set the resolution of the photos on your phone. You can go into the settings on your phone camera and set it as low as it will go. It may or may not meet the size requirements of the forum (I am not an expert on that phone).
If not, you will need an app to reduce the size of your picture. I use a free app called "Photo Compress" which you can download from the android app store. You can then use this app to resize your photos.
I understand this is technical, but people here will help you, or maybe you have a 7 year old grandchild who is an expert!
Good luck!!!!