Edit configuration yaml Slimmelezer

Hi
I am new to ESPHOME.
I want to edit the configuration yaml of a Slimmelezer+ I just bought.
Can this be done through Putty, Filezilla etc?
I am on an old version of HA 0.103.6 and can not install the ESPHome Dashboard addon.

I have now installed ESPHome in a Docker contaioner on my Synology NAS but I am not quite sure how to move on from here to be able to edit the configuration file.

Solved. I installed ESPHome on my computer and was able to send a new configuration.yaml to the Slimmelezer device.