Install the correct collet for the attachment you are going to use. The collet is a small chuck used for grasping the attachments for your rotary tool. To install the collet, engage the shaft lock button and then remove the collet nut. Use the collet tool to do this. Install the collet you need into the collet shaft then tighten the collet nut.
Press the shaft lock button and rotate the shaft by hand until it engages the
shaft lock. Insert the bit or accessory shank fully into the collet. Tighten the collet nut by hand or with the collet tool until it grips the bit or accessory shank.
Plug your rotary tool in.
Practice with your rotary tool on scrap wood or plastic to get the feel and balance of the tool. Also acquaint yourself with the different speeds.