Hi,
if you want to do a quick check there is the "Contains value" event that loops the entire array for you and returns true or false if the value you have indicated is contained in the array.
Otherwise you can start a "For each element" event, and insert a check sub-event to check if the value you are looking for is present at the "loopindex" position. If yes, then you can decide to delete the value present at that position.
I hope I've been helpful!