Regarding your questions, with originalworks you just call it as you did.
@tipu you can send funds to it by direct transfer to @tipu with memo deposit. In posts you like you can call it like tip! (just that will make the bot attempt to tip the author with 0.1 ).
Minnowsupportproject follow this guide: https://steemit.com/minnowsupportgroup/@discordiant/membership-tutorial-minnow-support-group I just send registration fees