Question
How do i plant another Aloe Vera plant from the one that I already have?

Answer
Hello Rosie

Aloe Vera are suckering plants - that means that they send out shoots just under the compost (or garden soil if they are outside - and the suckers produce new plants, usually quite close to the parent plant.

You should carefully scrape away the compost (or soil) and dig up one or more of these 'baby' plants (called 'off-sets') and sever the sucker close to it (or them) - they may or may not have roots.

If the off-set does not have roots just push the base into a half and half mixture of compost and sand - you can put more than one plant in a pot, depending on the size of the off-set.  If there are roots then plant into an ordinary potting compost.  

In both cases lightly water the plants in and place the pots in semi-shade at a temperature of about 59 - 60 degrees F and water them again after about 1 week.  

Once you see new growth, plant the off-sets which were planted in the compost/sand mix into separate pots using regular potting compost and water the plants in.  In both cases begin to water the plants with tepid water when the compost is almost dried out.

If your plant doesn't have any off-sets you can still get more plants by dividing the roots.

To do this take the plant out of its pot and simply cut down through the plant making sure that you get good healthy leaves and some healthy, plump looking roots, dust the cut with a plant fungicide (available from the garden center), and treat the cuttings as described above for rooted off-sets.

If the plant is in the yard - scrape away the soil to one side of it and, using a spade, cut down through the plant as above.  Replace the soil around the plant.  Treat the cutting as above.

I hope you get a good crop of new plants!