slicing the ball

i think i slice the ball because i am opening the club face when i try to put force into the swing with the right shoulder how do i prevent this

When you slice the ball does it travel left then pull back right or does it bend straight out to the right?

too many variable to tell w/o a video or more details. but my guess, at the finish of your swing, your weight is on your left toes. is that true? but the fact that it happens only when you try to "put shoulder into it" makes me think you are putting OTT shoulder into it because your weight is too far towards your toes.

Normally slicers are for beginners but with some practice and experimentation, you will develop a fade...

You could be swinging down on the ball and trying to lift it at impact. Try bending over more and "sweep" the ball off the tee. Something that help me, and I had a mean slice, was to put a tee in the ground in line with the target in front of the ball and try to follow through over that tee after contact. This helps if you are coming from the outside to the inside of the swing plane...another habit that creates a slice.