Dot character not allowed - Dlink DIR-878. How to fix this?

Hi, I am new here and need help with this issue:
-Wifi Name (SSID): "." (dot) is not allowed. When i tried to save, appears this msg - Invalid Wi-Fi Name. Only A-Z, a-z, 0-9, “-”, “_”, and spaces are allowed.
. What do i need to do to fix this?

Read this page , come back here if you do not understand anything on the page, flash to OpenWrt, come back here for help with OpenWrt.

You appear to be running the vendor firmware. For that, please refer to the vendor's support channels. This forum is focused on OpenWrt (a free, open source firmware) that can run on your device, but is not currently installed. If you use OpenWrt, we can help you here, of course, but we don't support firmware outside the OpenWrt project.

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