You then need to invite the bot to your server by going to Oauth2, checking bot and then checking the same permisions as above. You can then take the generated URL at the bottom and invite the bot.
Under Redirect in Oauth2 put your domain like https://your.domain.com/auth/discord/callback in the Discord Developer Portal. Copy the Client ID and Client Secret as you will need them for the environment variables below.
You will need to host this publicly somewhere for other users to be able to use it. I recommend using Digital Ocean for this as its cheap and you can deploy Docker images directly.
After inviting the bot to your server, join a voice channel and type !join to have the bot join the voice channel. Type !leave to have the bot leave. You can upload sounds to Soundbored and trigger them there and they will play in the voice channel.