All right, well first you click on "Style Editor" and "Edit current style". Once you have clicked that, it will take you to your editing page. Once you wait for the editor to load, you go in and decide on the colors you want for each block, and the font color you want, etc. Make sure you do not forget to click "Apply" after you have a chosen a color for a certain block in your profile. Click "Save Changes", and it will then take you to another page and ask you if you would like to change the current style you have now to the one you just created. Click, "Yes".
It should work. As for why your colors did not change after your first few times of attempting to edit.. well, check to see if you did everything I described.