Like many other publications, KMT has fallen on hard times. There is no specific way to fund KMT that I know of, but the journal's email address is firstname.lastname@example.org .
To subscribers of Kmt: A Modern Journal of Ancient Egypt
As you have likely received the fall issue of the Journal (31:3) in which the Editor's Report described the current financial situation of Kmt and indicated that barring significant financial underwriting -- this might be the next to last issue with little or no hope for winter. Due to the pandemic and worldwide lockdown, there was little or no distribution to outlets abroad or in the U.S. for the spring, summer and fall issues (the print run for fall in fact was shortened, but no less costly). Almost certainly, costs will keep rising, including printing and postal service. The Editor and publisher reached out to the Journal's Editorial Advisory Board and other individuals for suggestions and ideas of which there have been many, including a digital edition, which would be too costly and not practical.
However, there has recently been a bit of good news. Financial underwriting has been offered for the publication of the winter 2020/21 issue, which will complete 31 years of Kmt. After that (unless the proverbial knight in shining armor materializes) it has been planned to suspend publication until after the pandemic and economic crises are behind us with current subscriptions remaining viable then.