Please think twice before sending unsolicited mass airdrops. Although not forbidden this is something which is in general not appreciated by collectors.
But you may want to send pieces to several of your collectors, you can use this tool created by NFT Biker: https://nftbiker.xyz/fans, which will allow you to see who your collectors are.
You have two options if you want to send a piece: sending it either from your wallet or directly on objkt.com.
If you want to send it from objkt.com, synchronise your wallet, go to the page of the piece you want to send, go to the “actions” tab. You will need to indicate how many editions you want to send and the address of the recipient (don’t indicate the tezos domain, indicate the full address).
If you want to send it to several people, select “add recipients” and add their addresses.
Then click on “send”.
Please watch this video which explains well how to batch send when you have several pieces:
If you want to send it from your wallet. If you are using Temple Wallet for instance, go to “collectibles”, select the piece. For example, here I’m clicking on the first one.
Then click on send
And indicate the number of edition you want to send, and the address. Click on “send”.
Please note that the piece needs to be unlisted first if it’s an old listing as the token was leaving your wallet when you listed before the latest update. If it’s a piece which was listed after the recent update, you will be able to send it.
