How can I send message in miro support?

Assuming you are on a paid subscription you can open a Miro support request here: Submit a request – Miro Support & Help Center

However, unless this is an issue which only Miro support can address such as a billing matter, you are likely to get quicker support through this community as a number of “power” Miro users regularly respond to queries.

Kiron

@GS8888 - This help center article shows how paid subscribers can get to the support form from their Miro dashboard/board:

https://help.miro.com/hc/en-us/articles/360020185799-How-to-contact-Miro-Support#h_01F010RXA0E1S9C0WFQYX75R6C