Add your public key to the authorized keys file on remote server. To add you keys to the file, you can use the following command:
cat ~/id_rsa.pub >> ~/.ssh/authorized_keys
If you do not have the folder ~/.ssh/authorized_keys , you can create this with the following commands:
mkdir -p ~/.ssh touch ~/.ssh/authorized_keys
References
https://medium.com/@williamkwao/how-to-add-ssh-keys-to-an-ubuntu-server-6a3a5b1bee26