A J Perm PLL algorithm is used to permute the last layer (PLL) on a Rubik's Cube during the speed-solving process. There are two J Perm cases: J Perm A (or J(a)) and J Perm B (or J(b)). Here is a relatively simple algorithm for each case:

J Perm A (J(a)):
R U R' F' R U R' U' R' F R2 U' R' U2 R U' R'

J Perm B (J(b)):
R U2 R' U' R U2 L' U R' U' L

These algorithms are fairly short and easy to memorize, making them suitable for a beginner speed-cuber. Keep practicing these algorithms, and you'll be able to execute them more quickly and smoothly over time. Remember that there are many different algorithms for each PLL case, so feel free to explore others if these don't work well for you.
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