One way to get a #pubky address from a nostr privkey is 

1. Go to : https://app.pkarr.org/?
2. Click on settings
3. Paste seed into app
4. Hit save

You now will have your own pubkey address and you will be able to set records in the censorship resistant (10 millon node) decentralized DNS

It also allows connection to 100+ different networks. 

 I have zero idea what this is, but I have a feeling I soon will 

nostr:nevent1qqsx6ycu22cg8e9d5ws8kkcn0wh2mctzqdcjsxn822kgs6wcp2pumyqpzpmhxue69uhkummnw3ezumt0d5hsygx70mx3u2tk56km9la97ndcrf7cztytke5c4gqdeu08dtd4tm7kg5psgqqqqqqs8ckq04 

 What is paste seed in app? Does it paste private key? 

 Click on the settings icon 

 Is it safe? 

 You can Generate a new nostr key to test.  hex format