Here's a picture of the logic board showing the tabs. http://www.usedmac.com/catalog/images/185034_afrontl1.83.jpg
After breaking the first tab, you continued and broke the second? To avoid more costly repairs, and the logic board is pretty expensive, I would suggest taking it to a older experienced technician who might be able to secure the RAM modules without replacing the logic board. Soldering a new RAM receptacle onto a logic board is not something even I would want to attempt. Honestly some people are just not cut out to do delicate computer repairs.