Write to firstname.lastname@example.org.
Or just use the following form:
The AGEA Editora has its headquarters at the Gallaecia in Armis salle, a HEMA-dedicated space in the capital of Galiza. Although you definitely should contact us by e-mail, here is the address for reference:
Gallaecia in Armis: Artes Marciais Históricas Europeias
Avendida de Lugo 199 («Edificio Goldar», 2º mezanino)