Step 9 - Old Verbiage/Options

Select primary metric to track. Choose the `message` event if available or `first_open` otherwise...
1) first_open is not an option; login, session_start, Crash-free users, etc. are

Expand your draft experiment and select `Manage test devices`.
Paste in your Instance ID token and select Variant A for testing. Select `Add` and `Save`.
2) I do not see a 'Manage test devices'. Is this supposed to be Limit to a subset of users which doesn't seem to have an input field for specific Instance IDs?