How do I add or remove a management board member in an OÜ?

The shareholders decide, unless the OÜ has a supervisory board, in which case that board decides. The decision can be taken at a meeting, by written vote or by a unanimous written resolution. The change is then filed in the e-Business Register portal, signed digitally by a board member entitled to represent the company.

Corporate changes

Source: Changes in a management board, Centre of Registers and Information Systems (RIK)