The directions came with your heater IF not contact the manufacturer

Fertilize regularly according to manufacturer's directions.

You should read the manual that came with your GPS to figure out the directions. If you don't have the directions, you can go to the manufacturer's website for the manual.

By reading the directions first. Treadmills are made by a variety of manufactures in a variety of designs and each may have a completely different method on how to do so. If you have lost the directions, do a search online for them by name of manufacturer. Most times, you can find the directions for free or at very little cost. The directions may also be available on the manufacturer's own website.

The original directions should have came in the box but if they did not I have an alternative for you. Go online to Cisco they are the manufacturer and they will have the directions for you.