Online

You can fix it by upgrading your profile OP.

You need a gold account to use online MP functions and yours is currently silver.

You need a gold subscription in order to play online.

You still looking for someone to do co-op challenges

Hey there, sorry it was a little hard to understand exactly what you're asking. Do you want to make your offline profile an online one to retain game saves and achievement progress etc.?

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If so what you need to do it connect the Xbox to the internet and sign-in to your offline. There should be an option either on the dashboard where you avatar is on through the Xbox guide that says 'Join Xbox Live' if you hit that it will take you through
the profile creation where you need to add an email and billing details.

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Once that is completed you should have a randomly generated gamertag that has you previous games history and saves etc.

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I noticed that you already have a gold membership on this new account, I will just mention that you won't be able to combine the two accounts or transfer the gold membership between them.

You are a silver member, you need to buy gold.