>> "OK, so I, the Developer, is supposed to add the Email. But what Emails to use, and how is it used?"
Our examples assume the typical use-case. Namely, a customer buys your app and you know some things about that customer (their email address, their name, maybe their address, maybe their company name). So, when the customer orders your product you generate a product key and you can set the email address for the product key.
It's completely optional. You don't need to set it at all. Basically it's for your convenience so you can easily find customer's product keys.
>> "1) What Modules is Deployed where?"
We have a number of help article, and examples showing how to use everything. For example, if you want to use our pre-built order forms, you can: https://wyday.com/limelm/help/how-to-generate-product-keys-after-order/
>> "a) WebAPI: Is it Deployed on My Company Server or on WyDay's server(s)?"
Well... I'm not exactly sure what you're asking. The web API is in LimeLM. It's how you manipulate things in your account (generating product keys, deleting them, editing them, etc.). You *call* the web API from your server. See: https://wyday.com/limelm/help/api/
>> "b) Same question for TurboActive."
You include TurboActivate in your app. See: https://wyday.com/limelm/help/getting-started/