If you are new on amazon lightsail its difficult for you to access your phpmyadmin because you can’t access your database directly from URL i.e www.yourDomainName.com/phpmyadmin.
So before accessing your phpMyAdmin via SSH tunnel, what you need SSH client PuTTY is free for Windows and UNIX platforms. So download the putty.exe and also the puttygen.exe from the official website.
Step1: Now you need the SSH Access before downloading it go to the lightsail and select your instance then click on the options button and select Manage option
Now find the account page link and click on it a new page appears.
Now download the key and keep that key in a folder where you keep the putty.exe and puttygen.exe file.
Step:2 Open the puttygen.exe and load your key by clicking on the load button it will not show you the .pem file, change the file types all files now it will show you the .pem file, a popup appear, click ok and then click on the save private key button, give you key name i.e myKey and keep it on the same folder, it’s a .ppk file.
Step3: Now click on the putty, you need the IP of your instance i.e 18.104.22.168 get your IP from amazon lightsail, Add your IP in the Host Name field and also in the session field.
Step4: Now open the SSH and click on the Auth and click on the browse button, choose your .ppk file
Step5: Click on the Tunnels add 8888 in the source port and localhost:80 in Destination and don’t forget to click on the add button.
Step6: Now click on the Data and add the user bitnami in the Auto-login username.
Step7: Click on the Session and click on the open button. Note: if you have default session please select the session which you have inserted.
Step8: Now a window appears like this.
If putty ask you about cached this key just click on the yes button
Step9: Go to the browser and type localhost:8888/phpmyadmin it will ask you about credentials, to access the database using the root as username and if you have the password then add it otherwise get your password by access SSH on lightsail.
Congratulation you have successfully accessed your lightsail phpmyadmin panel using putty.