Check in your account control panel. You usually do get it with a domain registration.
How do I get the "free" ssl certificate namecheap offers upon registration, I just bought the domain I didn't see any free ssl option, can I still get it if I already paid for the domain?
During the checkout process there is an option to add the Free SSL certificate to your order. If you missed that, it won't be in your account, but try submitting a ticket and asking them if you can get one. If you just reg'd the domain they may be nice and add it to your account, maybe.
Edit: Oh, cool see you got it now. Ignore me and my slow typing :P