Solarpunk Press is, as of writing, completely unfunded. At the moment, there isn't any way to fund us -- I'm writing this just before I put the donate button up.
Our plan for financial sustainability is our Patreon campaign. We're launching that on August 31, and patrons won't be charged until October. We're taking the extra time because we want to make sure we're set up to fulfill all of the rewards (and we want time to pull rewards off if we figure out that we can't do them, before people have selected them.)
There's a lot less that goes into setting up a donate button, though, so we figured we'd put that one up now.
We will be reporting on our costs and use of donated money and Patreon funds.