Do you know how to make fields? If you don’t know how to make fields, you’d have to learn how to do that. There isn’t much reliable information on that topic (I’m told some–not a lot–information can be found, with some sharp eyes, in the Energy Awakening Course and then the learning curve of any skill.
Or you could find someone who knows how to make fields and get them to do this for you.
(I’m answering for this question because you had posted your question to an “anon” user. Just so you know, when you see a post from a user whose name begins with “anon” followed by lots of numbers, that name means that’s a user who has chosen to close their account. When the account here is closed, the forum software changes the screen name so that their posts here are retained.)
What’s your intention with your conversion? With all the fields we have here, might there be an existing field which already covers the affirmations you might be wanting to convert? That might be an easier and faster route for you.