Device type - OGN
Device ID - your icao hex code, look it up on GINFO. This should be also in your pilot aware via setup.
Registration - G-XXXX (eg your aircraft id)
Competition number- by default it will give the last two letters of your registration, if left blank but you could insert last three letters of registration. It's actually because gliders have a trigraph as well as the CAA registration, generally.
Also make sure you choose aircraft type in drop down box.
Should come up as a blue square with competition number. May take a 10 mins to come up initially as it takes time to 'absorb' your data input.