That information has not yet been released. I think it might be automatic because the relationship between mainnet wallet and ITN results wallet is already established within the system, but I could be wrong. The rewards wallet phrase is 15 words, balance wallet is same as mainnet one so of course 12 words.
Just make sure you have your recovery keys (15 words mnemonics if using Daedalus/Yoroi rewards wallet , and private keys if using accounts from jcli) and you’ll be fine. If you’re unsure about your 15 words mnemonics, you can simply attempt a restore via Yoroi testnet and test whether you see the rewards as expected.
(PS: There will be a FAQ released closer to mainnet, but sure as hell I do not expect the restore to be automatic - you will need your mnemonics to restore, and this is for very good reasons)
Everything was working fine on the ITN (I was able to check my rewards) until over a month ago when the testnet wouldn’t connect. Because it couldn’t connect I uninstalled the testnet and reinstalled the new version. STILL am unable to connect. So now hopefully IF I am ever able to connect and sync, AND I put in the correct mnemonic keywords to reboot the ITN pool wallet, all should be well?
This mnemonic will be 15 words? is that correct? And it doesn’t matter the name of the wallet?