Does Digipan have the ability to auto-upload to eQSL or does it produce an ADIF file which then must be uploaded?
If the former, there will be a place withing Digipan where you can configure your eQSL username, password, and nickname (if required).
If the latter, produce your ADIF file with Digipan, then go to the eQSL "Upload ADIF" function here to upload that file,
http://www.eqsl.cc/qslcard/enterADIF.cfm.
73, Dave - VA3KAB