To delete profile(s),

• Go to your Magento admin panel.
• On the top navigation bar, place the cursor on Mlibre.
• When the menu appears, click on Manage Profile.

• On clicking it, you will be navigated on the page which appears as:

• Select the profile(s) by checking the corresponding box(es).
• Now click on Actions drop down on the top right side of the page as shown in the above image.
• When the menu appears as shown in the above image, you can see the Delete option which you need to click at.
• Now click on Submit button.
• The selected profile(s) will be deleted.

To delete all profiles, 

• Click Select All on the upper left side of the page as shown below:

• Now click on Actions drop down on the top right side of the page as shown in the image below.

• When the menu appears as shown in the above image, you can see the Delete option which you need to click at.
• Now click on Submit button.
• The selected profile(s) will be deleted.