How to upload your custom logo in your Drupal theme

Step 1: Log into your Drupal 7 Admin panel.
Step 2: Using the top menu area, click on the ‘Appearance’ option.
Step 3: This will bring up the themes page where it lists all themes installed within Drupal 7. Locate the Settings tab at the upper right corner of the screen and click it.
Step 4: This brings you to the main Appearance page. You will see Global Settings followed by the name of all enabled themes as a top menu bar. To set the option globally, click on the Global Settings option. To set it for a particular theme, simply click on the name of the desired theme.
Step 5: You will then need to locate the Logo image settings section on the page. Uncheck the box labeled Use the default logo and a few new fields will appear. These are Path to custom logo and Upload logo. Use the Browse button and upload your logo.
Step 6: Click on the Save Configuration button at the bottom of the page to save the change.