|There are many places on the web where you can get tips about refilling your particular cartridge. Web sites that sell refill ink often have them.|
It's very important to let the cartridge sit for a while after refilling it BEFORE you re-install it in the printer. If you install it in the printer too soon, if it does leak, it will leak in the printer, and make a mess you will need to clean up, if it wasn't in the parked position at the time.
If it's going to leak ink, it will do it within 10 minutes or so.
Sometimes it won't leak until you have dabbed the ink outlet or the print head such that ink easily appears on a tissue or paper towel, THEN it leaks.
If the ink outlet on an ink cartridge (no integral print head) is dry or had poor flow when you dabbed it with a tissue, you may need to saturate the foam or whatever there with a few drops of ink, and THEN it will leak, if it was going to.
If you can see the ink level from the side when you fill it, don't put in more ink than it takes to fill it to the top of the sponge or whatever inside of it - if you put in more than that the ink will probably leak out of the bottom for sure.
If the cartridge is opaque, similarly, if you can see the top of the sponge or whatever through the fill hole in good lighting, you don't want to see liquid on top of the sponge or whatever.
It's better to under fill it a bit rather than over fill it. E.g. inject ink into it with a syringe until ink appears at the top of the sponge or whatever, suck a bit out, say, at least a 1/4 ml more than it takes for no liquid to appear above the sponge or whatever.
If the cartridge has been sitting more than a short while with no ink or very little ink, you MAY need to be patient and just let it sit after refilling it for a longer time, as much as overnight, before it will work properly. Sometimes dripping a few drops of ink into the ink outlet speeds that up.