https://www.epo.org/en/service-support/faq/law-practice/list-professional-representatives-entry/which-attachment-format

Which attachment format should I use for an entry or re-entry request?

If you are a user of MyEPO, fill in the online form following the instructions provided. 

If you’re not a user of MyEPO, please file your request as an attachment in PDF format. Your attachment should be named as follows: Surname, First name_request.pdf