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You can post and comment if you signed in with your posting key, but you can't make any wallet transactions. You need your active key to do that. In both cases you didn't need to download or install any wallets. The password you use at login defines what you can do for that session. It's not advisable to login with your active key for every day use due to security reasons

yes thanks i figured it out a bit, i installed the extension and now i sign every action with my wallet.