やっぱり is simply a double consonant degrading of やはり and as such it is less formal than やはり. The newer generation has even further degraded やっぱり to やっぱ. Unfortunately, it is here to stay.
Add Entry to Your Study List Choose the priority of studying you want to assign to this item from the drop-down select list
and then hit the save button. This will be used for sorting your personal study list.
If you wish to delete an entry that's already in your list, just set the difficulty to '0'