ToastyT

Site URL: https://www.danramsey.co.uk
Help1 :D.  
I have styled the secondary navigation as a button.  I want that to activate the promotional newsletter subscription in brine via a button in the secondary navigation.   I don't want it to pop up at all without peoples choosing.  
Logic tells me there must be a way of getting the nav link to trigger  popup? 
I don't want to use a third party plugin.  When I am already paying x for ss, and in ss there is a tool for creating buttons, creating popups  and collecting emails, I don't see why I should have to pay more when all I need to do is connect two things that already exist. 
If you can help, you will have prevented me wasting even more evenings of my life trying to work it out :-).
regards Dan
...image attached. ignore first which is when I was thinking about the form block, its really triggering the promo block I am interested in: second image

You can add to blog page header, or try insert Code Block > Paste above code

You can insert JavaScript code to Page Header to create redirect without using redirect feature in SS
Add to Page Header
<script> window.location.href = "http://beaverhero.com"; </script>  

@erbush1988 A common way to achieve this is to provide links to various products at different price points, or several variants of the same product at these different prices. Customers can then add one of these to their cart. For example, the could choose the $0, $10, $20, $50 or $100 variant/product.
@ToastyT There isn't a way to allow them to pay literally "whatever they want" using Squarespace tools. The value must be predetermined. The only way to take payments for any amount is by adding some code to a Squarespace site from a third-party payment provider. Note that this will only allow you to take ad hoc payments; they will not be integrated with Squarespace Commerce in any way. 

As the title says, I have items which I'd like to offer at no cost BUT if a customer wishes to donate, I'd like them to be able to input a value of which they can pay.