My char doesn’t need to look like that. This is a fantasy adventure not a real life modern day couch potato in basic chain mail.
He needs to if he'd be wearing Chainmail. Otherwise he would be wearing a Chain Shirt.
You can't host images directly on the forum, you have to host them on some other image hosting site like say imgur and then link then with
[img]www.imageaddressgoeshere.com/image.jpg[/img]
If you click the "open full editor" button under the quick post field you can click the link image button (a small picture of a mountain against a blue sky) in the editor toolset. But you still need an address to somewhere on the internet to link from.