Video Guide

API Key setup
Create an account at https://elevenlabs.io/speech-synthesi

Here is a brief rundown of what subscriptions are worth for:Free $0 = Not worth it apart from basic testing.
Starter $5 = Good for beginners, gives you around 40 minutes of audio content a month. Can create custom voices.
Creator $22 = 2 hours of audio content. Not a whole lot for a month but better.
Independent Publisher $99 = 10 hours of audio content a month. Actually usable but its a lot of money.

Once you pick your subscription select your profile at the top right of the screen and click "Profile"

Copy and paste this API key into your configuration. 

Changing the voice
Generate whatever custom voice you want with Elevenlabs and make sure its in your voice lab.

Go here: https://api.elevenlabs.io/docs

Under Voices - Get Voices click Try it out
Enter in your API key from earlier and click Execute
You should get an output of all the voices linked to your account. Search for the name of the voice you want to use and copy its voice-id
Paste this voice-id into the configuration file.
Herika should now sound like the custom voice you have created for her.