Loading tip into UICollectionViewCell

I am just starting to use UICollectionView, so bear with me!

How to load a cap into a cell?

It seems I need to register the nib and the class to be used, but that doesn't work.

code:

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    [collectionView registerClass:[CluelessSymbolCell class] forCellWithReuseIdentifier:@"Symbol cell"];
    [collectionView registerNib:[UINib nibWithNibName:@"CluelessSymbolCell" bundle:[NSBundle mainBundle]]  forCellWithReuseIdentifier:@"Symbol cell"];

    CluelessSymbolCell *cell = (CluelessSymbolCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"Symbol cell" forIndexPath:indexPath];

    CluelessClue *clue = [clueManager clueForIndexPath:indexPath];

    [cell.backgroundImageView setImage:[UIImage imageNamed:[clue.imageNames objectAtIndex:0]]];

    return cell;
}