I have trouble with that edge. Please give algorithm or images for solutions for turning it up so that I can form a cross.
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The algorithm is
$r \ U^2$ - X - $r \ U^2 \ r\ U^2 \ r' \ U^2\ l \ U^2 \ r' \ U^2\ r \ U^2\ r' \ U^2\ r'$
Where $r$ means you have to turn two layers from the right upwards and $r'$ means downwards, $l$ means you have to turn two layers from the left downwards. and x means you have to turn the whole cube one face upwards.
$\times$ one face up
$lU^2$ remember left down!
Now you can solve the top layer.
For explanation : https://www.youtube.com/watch?v=h6EUHMQ71nA
Better answer here: https://www.speedcube.us/blogs/speedcubing-solutions/4x4-oll-parity-algorithms
OLL Parity Algorithm 2: r', U2, l, F2, l', F2, r2, U2, r, U2, r', U2, F2, r2, F2
Flips the edge and only the edge. Nothing to solve after that.