he wants me to duel 200k vs all my items and he said hes tiago but when i told him to relog in for proof his using many excuses his name is "SMARTPHONE" gm's can you check about him so you can ban scammers
and btw how to post bigger pics?

Send a private message to a GM to report him for attempted scamming. They will check on the details and whatnot.

Another way would be to PM tiago directly and ask him about the duel. Why would you ever duel someone who is not playing on their main for items/tc on their main? (Dueling with random users is shady anyways)

For the pictures just post the url into IMG tags.

Example

[IMG]https://imagehostingsite.com/403rf03[/IMG]