You can unsuspend cards in Anki by first opening the program, going to the Browse button, then highlighting the cards you want to unsuspend and right clicking for the option of Toggle Suspend. That is it.
Alternatively as beautifully brought out by reddit user Gear5th:
- Open Card Browser. (Press B)
- Click on the Suspended tag.This will show you all the suspended cards. (Yellow = suspended, red = marked/marked+suspended)
- Select a suspended card, and click suspend. (This will un-suspend it)Once un-suspended, the card will look white (or red if it is marked)
Here is a picture of both processes:
So the process is a lot like the process for reseting your anki deck.