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In the wallet, near where you made the backup (under settings) there should be an option to restore a wallet from a backup.

Note: When you restore a wallet from a backup, your 'current' wallet will go away. If you have any tokens in there, be sure to back it up too before it is replaced.

This is why I deleted wallet... It ask that I am in single address wallet
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When I want to change this I can't
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Hmm, sorry - I don't know. You could try contacting the Byteball team. Here is their official post: https://steemit.com/steemit/@punqtured/official-byteball-airdrop-to-steemians

Ok, thanks!

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