How are you doing? *winks*
Okay so we've going to finish of the cover now. Technically you should have this by now:

Open up the Polarr app

Now open up the image by clicking on it.

Scroll through the effect until you find chill and click in it

Click on the save button in the right hand corner and click save copy when the options come up.

Now open up good old phonto

Click on photo albums and choose the image we just made with polarr

Now just tap anywhere to add text

Type in the letter Z

Change the font, make sure you've downloaded the fonts Optimus Princeps and Signerica Medium

Click on my fonts and choose Optimus Princeps

Click on the style button and go onto shadow. Choose the second one from the left.

Click on the create colour pattern button

And go to the top of the screen where it will probably say horizontal and change it to vertical

And fiddle around with the colours until you get something that looks like this

Once you've creates the pattern click the save button because we will be needing it later

Add new text that says 'squared' and make it Optimus Princeps, putting all the same effects and Colours on it that you did to the Z. And position I underneath it. To find the colour pattern you created when clicking click the three lines a d then go onto my patterns. It will be there. Make sure to make it vertical.

Once all of this is done add one more bit of text and make it a username. Mine is 'KittyOnKeyboard' a d since it is for my book cover it would make sense if you used that too.

Select the font Signerica Medium and do all the same effects to it that you did to the other two pieces of text.

Position it in between the other two words like below and save the image.

Go back into Polarr with your new image and add the finishing touch by putting the effect Hadean onto it.

All done, phew.

Did it turn out all right? If it didn't let me know and I'll redo the tutorial and try to make it simpler although I thought this was okay... But who knows??