If it is the track rod end that you have(about 4" long with a tapered pin on the end) look at the one on the car it may have a nut at the long end of it on the rod,slacken the nut 1/4 of a turn then unscrew track rod holding the rod still with a pair of mole grips(after splitting it from the joint)screw on new track rod end till it touches the nut fit the tapered pin in the hole and tighten the nut back to lock it.The lock nut position is very important as it determines your tracking,you should have tracking done by garage afterwards to prevent poor tyre wear.You may need a splitter to get the track rod end free.
Rich, December 2007