It would greatly help to know what seeds they are
Put them in a dish of water. Top watering can wash the seeds deep into the middle of the soil and kill them.
Also, Dunecraft products have a pretty bad reputation. The seed viability is questionable at best, and there is a lot of misinformation on the packaging. I wouldn't expect too much, but maybe you'll be lucky and get a few good ones.
...just buy mature plants of the species that you wanted in the kit. All of them are pretty common so you shouldn't have too much trouble getting some. Growing from seedlings is very hard if you are just starting out anyway, and they take a while to grow to flowering size.