Error 500, can't access to my website

Source: https://wordpress.org/support/topic/setup-stepstroubleshooting-stepsremoval-stepsrequirementscompatibility?replies=1

htaccess file troubleshooting steps: Unable to login into your website:
1. Use FTP or your Web Host Control Panel File Manager and delete the .htaccess file in your website root folder and the .htaccess file in your wp-admin folder….

After doing step 1 above you should be able to login to your website. Do these steps below:
1. Copy this code below to this Custom Code text box: CUSTOM CODE DO NOT SHOW DIRECTORY LISTING/DIRECTORY INDEX
2. Click the Save Root Custom Code button.
3. Go to the Security Modes page, click the Create secure.htaccess File AutoMagic button and activate Root folder BulletProof Mode.

# DO NOT SHOW DIRECTORY LISTING
# Disallow mod_autoindex from displaying a directory listing
# If a 500 Internal Server Error occurs when activating Root BulletProof Mode
# copy the entire DO NOT SHOW DIRECTORY LISTING and DIRECTORY INDEX sections of code
# and paste it into BPS Custom Code and comment out Options -Indexes
# by adding a # sign in front of it.
# Example: #Options -Indexes
#Options -Indexes

# DIRECTORY INDEX FORCE INDEX.PHP
# Use index.php as default directory index file. index.html will be ignored.
# If a 500 Internal Server Error occurs when activating Root BulletProof Mode
# copy the entire DO NOT SHOW DIRECTORY LISTING and DIRECTORY INDEX sections of code
# and paste it into BPS Custom Code and comment out DirectoryIndex
# by adding a # sign in front of it.
# Example: #DirectoryIndex index.php index.html /index.php
#DirectoryIndex index.php index.html /index.php

Reference|Source: http://forum.ait-pro.com/forums/topic/read-me-first-free/#internal-server-error

500 Internal Server Error After Activating BulletProof Mode for your Root Folder

Some Web Hosts do not allow you to use the “Options” Directive in .htaccess files. If you see a 500 Internal Server Error then comment out the “Options” Directive by adding a pound sign (#) in front of Options -Indexes in your Root .htaccess file…