New guy question

Hi guys/girls,
What size and format do photos have to be to post on this forum ??
Have re-sized and dropped quality to try and post them but 
" Computer says no"  we dont except that here. :confused:
Sorry if this is the wrong place to ask, mods move it if it is.
You need to upload your photos to a place like Imgur and then press share and copy link to clipboard and finally post the link in your post here.

The Hot Pepper

No he should be able to upload.
I used the windows 10 app to resize, but when uploading this site says it does not accept this format ? Not sure what format it needs to be?
I will keep playing around and eventually work it out. Not sure if the photos(file size) is too large or if it has to be Jpeg etc.