If it was me I would just start over and take more cuts again. Always make sure to take cuts from a healthy plant. This will give you quicker roots and quicker growth once the roots develop. As for them Root Riot or Rapid Rooter plugs I always soak them or dip them in some RO water. I give them a little shake to take any extra water out of them. I use Clonex and it has never failed. From your pics, it looks like you also used Clonex from the dried gel on the top of a few of the plugs. Also once you pop them in the dome spray once and close all vents and leave them alone for at least 10-14 days under low light. Once you hit those 10-14 days you will start getting roots. Temps should stay around 75-85F. Higher temps will promote faster rooting but too high can also cause stem rot or wilting.