how to deal with this opening

Like this:
Click on the symbol by the game.
Click on a symbol that sort of looks like this: |_ \|/ _|
Copy the PGN thing.
Return here.
Click on the chess board symbol at the left, just above the comment box.
Click on Load PGN.
Paste the PGN thing into the box.
Click on Load.
Click on Insert.
Click on Post.