Garrysmod not appearing

My computer has recently crashed badly, as a result having to be put back the factory. I have reinstalled Garrysmod, however, when i go to extract something to addons. I go down the same road, c:Steam, steamapps, username and garrysmod and what not. When i get the part in viewing the games like half-life and Garrysmod, it doesn’t seem to appear. Any suggestions into why its not there?

start the game and then see if the path is there, happened to me because i just installed gmod, path wasnt there and i started it and it was there

thanks, it works now