There is two ways of joining:
With the GUI
Using the CLI (command-line interface)
It can take up to 30 minutes (100 block confirmations) before the pool contract is switched from your former pool to Findchia.
Once your switch is successful, you can log in to your Findchia Dashboard.
Joining Findchia with your existing plots is simple. In the GUI, click to the “Pooling” tab on the left sidebar, then locate the NFT connected to the plots that you want to move over. Click the “Change Pool” button. In the “Connect to pool” field enter:
https://pool.findchia.com
Click “Change” and you are done!
After this point, it can take up to 30 minutes for this process to complete
Next you should navigate to findchia.com site click on settings then click on Add contract and paste the link you copied earlier and press "Add"
Please not that the pool ligin link is valid for 5 minutes, after this timeout you should repeat steps above
Enter the following command to show info about NFT plots:
chia plotnft show
Note the wallet id (above Current state), you'll need it in the next command:
chia plotnft join -i {WALLET_ID} -u https://pool.findchia.com
replace {WALLET_ID} with data obtained from previous command
It will ask for your confirmation, check the details and confirm with Y
After contract is created please follow steps listed in GUI section