The steps are the same for both Manager and Studio.☀️
You can double-click directly on the text field on the canvas and start writing.
However, if you feel more like typing in a field where there's no need to hide layers on top, you can go through the steps:
Enter your template
Click on your text layer
Go under "edit"
Look under "Text Properties" and you will find the text field
... and then just edit away
This means that every change you can make in your text editor module in your workspace you will see displayed in the text field so you can follow the design of your text.
We have also created a short video showing how you reach it and how it works (see below):
☝️ Instead of hiding layers to reach and edit an underlying text layer simply click on it in your layer menu and change the text or design in the text field. 👩💻
Happy writing 😄