Most digital photos are a couple of megabytes.
The Avatar and Signature need to be smaller. I use a photo editor to reduce the size of the image density to get the file size under the maximum.
There is no maximum size on the photo sites.
Then you can drop the link to your photo into the thread.
You will see the photo when you click on the link.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW