What do I do after I put the yeast in the coke bottle and seal it off completely (no hole in cap)... Meaning how do I check THAT if it has pressure or not b/c I wont be able to squeeze the bottle.As suggested in my earlier PM to ya, check for leaks around the cap area, and make sure the yeast is still good. Since you're not using a glass diffuser or anything at the end of your airline tubing, we can take out the lack of pressure to run those items out of the equation. That leaves us leaks and bad yeast.
You can test the functionality of the yeast by putting it in a coke bottle and sealing it aff completely. It will pressurized the coke bottle in a few hours indicating that Co2 production is occuring and the yeast is good. And you can check for leaks around the cap with a soapy solution to look for soapy bubbles from the leaks.