i have a regual essance and im trying to use it in the generator but it wont let me, am i doin something wrong?

If you click on the bar that says "No essence loaded" 'click to load an essence'

Select from the list of options, mythical, enhanced, regular and your own should be highlighted blue.

Once you selected your essence you should be able too start placing traits, colours etc then click the large 'generate pet' button at the bottom of the page to make your sylesti come to life!

Hope this helped, good luck!