I know that you need to enter some information in the FIX page,I want to add airports in the way with the range ring.How can i do it?ThanksErez

Just enter the ICAO airport designator and then the distance you want the range circle. For a 150 nm range circle on LAX you would enter KLAX as the fix and /150 on one of the dashed lines below. You should be able to enter 3 range circles of up to 512nm. If you do not know thew ICAO designator then just use a VOR on the airfield or close by.CheersSteve