how do i log back into imessage?

Hello tyrese276,

You can use the steps outlined in the following link to sign in and use iMessage: Set up Messages on iPhone

Sign in to iMessage

1. Go to Settings  > Messages.

2. Turn on iMessage.

If you experience an issue signing into iMessage, this link outlines what to do: If you can’t turn on or sign in to iMessage or FaceTime

Thanks!