To undisavow a link, you need to:
- Filter your disavowed links by clicking "New Filter":
Then selecting Disavowed >is>Disavowed:
2. Select the link you want to undisavow, click on the "Disavow" button, and then on "Remove from disavowed list":
If you want to undisavow a lot of links at once, this article may be helpful.