How to terminate the rights of representation in the EDS?

After having logged in to the EDS, you may terminate the rights of representation for other representatives. After selecting Settings -> Agreement and annexes, select in the list of annexes to the Agreement the representative for whom you want to change or revoke the rights. After opening a card of the attachment to the agreement, it is possible to change or terminate all rights.
To waive the rights of representation that were conferred to you, after having logged in to the EDS, you have to select the taxpayer represented, whose representation you want to waive. After selecting Settings -> Representation, click on the button Waive the rights conferred in the window that has opened. 
You may also terminate the rights of representation by completing in writing the annex to the agreement that you will find here (in this case − Termination). You may serve it directly or send by post mail to the STI Service Division. When the annex is sent by post mail, a copy of the identity document of the person having signed the annex to the agreement certified by the Notary Public must be enclosed.

Information, how a foreign country citizen can become STI electronic systems user / receive means of login / to represent another person, can be found here.