Welcome! I'm new too.
I would highly suggest not adding more fish.
I did pretty much the same thing you did, but I added 9 guppies all on the same day. I was totally clueless about cycling.
You really should read the article and follow the directions. Get an API test kit so that you can monitor your water at home. You'll be doing a lot of that and water changes. You can get the kit online for about $20, and most fish stores I have been to have it as well.
You will want to do at least a 50% water change and make sure that when you replace the water you are conditioning the tank prior to adding the new water, or directly to the new water BEFORE adding it to the tank.
Do you have a conditioner? If so, what kind?
You should really find out what kind of fish you have too so that you can make sure they are suitable for your tank.
I joined the middle of October because my fish were sick. I am still cycling this tank and doing water changes every day (though I am down to every other day or two now). You aren't the first.