This will allow you to enter a custom name on the product.
1. Go to Settings.
2. Press General Settings.
3. Scroll down to Tweak Functionality.
4. Under ENABLE NAME EDITING ON CUSTOM-PRICED ITEMS, select Enabled if you want a user to have the ability to change the name of a custom-priced product added to the cart. Select Disabled from the drop-down menu if you do not.
5. Scroll down and press Save.