The best option is if all users in the list already share a common user field that you can use.
For example, say you want to launch a guide for all managers, you can do
But what if you don't already have such field/s? What if you want to specifically target a set of users based on their id or email? No problem, send us a excel spreadsheet with this list. An Iridize support representative can upload this list adding a special field only to the users in the excel.
So let's say you want to upload such a list and save a field called show_special_guide. After the upload you will be able to create the following condition: