Go to the Slideshare homepage here: https://www.slideshare.net/. Then, click the "Login" button at the top right section of the page to log into your account.
Once you are logged in, click on your avatar at the top right section of the page and select the "Account Settings" option from the drop-down menu.
Click the "Delete Account" link under the Account tab of your Settings page.
A pop-up window will appear asking you to confirm if you want to delete your account, click the "Yes, Delete my Account" button.
In another pop-up window, tick the box "Yes, delete my account", then select your reason for deleting the account from the menu, and click the "Delete Account" button at the bottom.
You will see a confirmation once your account is successfully deleted.