You should be able to find info/video on how to adjust your brand/type slide. If you mean it is not centered in the opening, too close/hitting on one side, it should have adjustment to correct. Be aware, sometimes adjustments are a bit of compromise. To make one adjustment perfect, may make another adjustment out of line. If you don't have any experience, it may be best left to a pro. I'm not sure CW would be the first choice. If you could get a good mobile repairman, he could do it on site, and you could learn about adjusting, by helping/watching.
Jerry