After downloading the Tonkeeper Wallet, click the "Back Up the Wallet Recovery Phrase".
This is for your financial protection, never let these 24 words be available to anyone but you, if anyone has access to the 24 words, they will have access to you cryptocurrency funds.
The 24 Recovery Phrase words will allow you access to your account if you were to ever loose your phone or forget the password. If you loose your 24 Recovery Phrase words, there isn't anyone who can help you after that point, all cryptocurrency will be lost on the account that cannot present its 24 Recovery Phrase words when needed. If you can still log into the Tonkeeper Wallet, then you can still download the 24 Recovery Phrase words under the "Settings & Backup" section.
Once you have saved (Screenshot or write down) your 24 Recovery Phrase words. The next step is to make sure you have the 24 Recovery Phrase words correctly written down. They will ask for 3 random numbers that correspond to your 24 Recovery Phrase words.
THE WORDS MUST BE SPELLED CORRECTLY AND IN THE CORRECT NUMBER ORDER THAT IS BEING REQUESTED.