Pics are easy. This is for my iPad
Go here:
https://postimages.org/

Click the blue folder marked “Choose images”

That should open up a link to your computer photo album

Choose the pic you want to add. Click on it

In the upper right hand corner, click the blue “Add”

It’ll bring you to a screen with a bunch of options with codes. You want
“Hotlink for forums”. On the right there’s a clipboard. Click on it and it’ll copy the link

Bring the link here and paste it in the text reply box.
Preview the reply and your pic should be there. If it is, hit Post Reply and you’re done.