Load a tube of caulk into a caulking gun, making sure it's well seated at both ends
Use a utility knife to cut the tip of the spout. Cut off as little as possible, taking into consideration the size of the 'bead' of caulk you need. Some people like to cut the spout at an angle, while others cut it straight; it doesn't make a big difference
If using caulk that comes in a cardboard tube, look for a second seal at the base of the spout. Insert a nail or awl through the spout to puncture the seal. Many caulking guns come with such a puncturing device. (Plastic tubes usually don't have a second, inner seal.)
If you want more precise instruction then go to the link below
Read more: How to Use a Caulking Gun ' eHow.com http://www.ehow.com/how_8790_caulking-gun.html#ixzz19CNkzmXG
Here is also a vid that will show you haw to redey the gun for use.
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