I’m not sure @reeceh16 means what I understand, but I’d describe my need with his/her same words (except for the template part, which I do not understand either). I need a text link like this one to open a popup without reloading the current page.
EDIT: I’ve found the solution myself in the LP docs. Look at the “Using Popups” section. I report that here because this question came up in my Google search results before the documentation itself.