This is easy to fix!
First, make sure your Minecraft username is set correctly. To do that, go to the Account (gear) tab in the middle of the LearnToMod homepage. Then check that your Minecraft username matches what you see on your Minecraft launcher Exactly - Capital letters and all! It most likely shouldn't be an email. It should match the name you see next to the Play button on your launcher. (Welcome, __ )
For example, if your Minecraft username appears on the LearnToMod homepage as myusername but when you look at your Minecraft launcher you see Myusername you'll have mod loading problems or problems running commands.
If it IS set correctly then you can try using the command square on the server admin page to run "op YourMinecraftUsername". (Just replace it with your real minecraft username)