Prevent Hotlinking from my website

Hi there.

So i’m running a website and it has several images. I’ve found another website that is hotlinking my images

The URL of the image that is being copied is this one:
“https://apostalegal.pt/wp-content/uploads/2015/10/Captura-de-ecr%C3%A3-2015-10-24-%C3%A0s-05.02.21.png”

I’ve already added what i’ve searched on the internet to .htaccess though it is not working. Here is a copy of it:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteRule ^autenticacao/?$ /wp-login.php [QSA,L]
RewriteRule ^autenticacao/register/?$ /wp-login.php?action=register [QSA,L]
RewriteRule ^autenticacao/lostpassword/?$ /wp-login.php?action=lostpassword [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^https://(www\.)?apostalegal.pt/.*$ [NC]
RewriteRule \.(gif|jpg|jpeg|png)$ https://www.mydomain.com/angryman.gif [R,L]
</IfModule>

# END WordPress
RewriteCond %{HTTP_HOST} ^apostalegal\.colourinmusic\.com$ [OR]
RewriteCond %{HTTP_HOST} ^www\.apostalegal\.colourinmusic\.com$
RewriteRule ^/?$ "http\:\/\/apostalegal\.pt" [R=301,L]

RewriteCond %{HTTP_HOST} ^webmail\.apostalegal\.pt$ [OR]
RewriteCond %{HTTP_HOST} ^www\.webmail\.apostalegal\.pt$
RewriteRule ^/?$ "https\:\/\/n1plcpnl0044\.prod\.ams1\.secureserver\.net\:2096\/" [R=301,L]

What can I do? Thanks for the help.