Now go to Java i2p console http://127.0.0.1:7657/configfamily page and Join Existing Router Family selecting the file your-family-name.secret to join that family.
([source](http://zzz.i2p/topics/3313))
Export to i2pd from Java-I2P
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Go to Java i2p console http://127.0.0.1:7657/configfamily page and export family key. You'll have a file `family-your-family-name-secret.crt`. It contains both the private key and the public key certificate.
Copy it to `your-family-name.key` and `your-family-name.crt`.
Edit `your-family-name.key` in a text editor to remove the certificate part so it contains only the private key part.
Edit `your-family-name.crt` in a text editor to remove the private key part so it contains only the certificate part.
Move the `your-family-name.key` and `your-family-name.crt` files to the i2pd /certificates/family/ folder, as instructed [here](https://i2pd.readthedocs.io/en/latest/user-guide/family/).
This assumes that i2pd/openssl can handle the PKCS#8 format for the private key.