Hi!
Well I don't know, if this is an bug, but when I click the Link

https://discordapp.com/developers/applications/me/create
shown in the description on the spigotmc page it just shows that and after thinking about it
1/2h I've not found a walk around so maybe you could help me.

MfG
EsGibtKeineMitte

you're using an old guide, see up-to-date instructions here: https://github.com/DiscordSRV/DiscordSRV/wiki/Installation