You can upload the alternative text in Site Builder for an image by knowing the filename of the image. Most browsers have a Open Image in new tab option, when you hover and right click on the image. This will give you the file name such as "My_profile_image.jpg", you can then do the following:
If your site is getting spam, you can enable the "Captcha" module, which will allow you to set up the typical challenge-response test of jumbled letters. This prevents automated spam tools from submitting.
Sometimes you will want to hide your website, either because new content is not finished yet, you are re-launching it with new changes or for some other reason. You can do this rather easily with Drupal.
After logging into your Administrative account, go to Configuration -> Development -> Maintenance Mode
You will need admin-level privileges to change the name of your site.
Assuming that you do, then log into your site and use the admin toolbar on top of the page to navigate to "Configuration" > "System" > "Site Information".
On that page, change the value of the "site name" form field to your liking and save the form by pressing the "Save Configuration" button at the bottom of the page.