No money is needed to get active on this board- you just need to start posting and get to know everyone. The best way to get involved is to read as much as possible and comment OFTEN!

If there is ever anyone who needs help and you are able to provide it, just jump right in and offer your help!
If you want to help animals though, the best way is to get involved in your own community- there are lots of ways to help animals in your community without spending a dime.
Since you are unemployed you probably have some extra time on your hands- contact your local shelters and humane societies. Most of them are probably in need of help. You can volunteer a few hours per week to clean out cages, feed the animals, socialize the animals, walk the dogs, etc.
Do you have any special talents? If there is something you can make and sell, donating some of the profits to rescue? This could help you out as well- you could donate half the profits to rescue and put half the profits in a fund for your own pets.
Do you have old blankets and towels laying around the house? Buy some food your dog doesn't like? Read the wish list of your local shelter and humane society and there may be something you have laying around that they could use.
Do you have a senior complex in your area? Many senior citizens have pets and may need help caring for them. You could put up an ad offering to help exercise their pets if they can't, or help to watch them if they need to be in the hospital or go to the doctor.
Good Luck- helping animals is so rewarding.