How do I add instances?

Very new to Glyphs, but why am I not able to add any instances to my font?
I have two masters set up.

https://glyphsapp.com/tutorials/multiple-masters-part-3-setting-up-instances

It would be helpful to you to read Part 1 and Part 2 of the tutorial also. Excellent information.

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You need to press the + button in the lower left to add an instance.