|There are a couple methods to do this. The instructions that came with them will tell you how. Since you haven't mentioned what brands they are, we can't give you specific instructions but the following should help you out.|
1. Remove the old dongles that came with the old wireless devices and put the new ones in.
2. If they are of the same brand, usually you can go into the software control panel that was installed from the CD that came with them or downloaded from their website and "pair" the new devices.