... the papertowel must be wet, at all times, not wet soaking...
its good if you cover them with another papertowel wet as well, and put it in a dark warm please, i have see from my experience that if you try to germinate under the 20°C it dosnt work... and if you try to germinate over the 26°C dosnt work eather... if its over the 30°C the seed dies... somehow... and never sprout...

i use to germinate in a shot glass, with wet cotton in the bottom, i put the seed and cover it with another wet cotton. i put them in my room and 1 day later the seed starts to sprout!
some seeds take up to a week, so be patiente, over a week i had never seen any seed that took more than 7 days...