Yes, you can change attorneys.  The requirements and procedures vary greatly depending on the country however many countries will typically request a Power of Attorney form from the trademark owner designating the new representative. 

 

Marcaria.com

If you would like to designate one of Marcaria.com´s attorneys to take over your trademark, or provide a legal service such as responding to an office action or opposition, please email us at info@marcaria.com with the trademark, owner and country details.