Icons not displaying on social networks

Also, I don’t have easy access to these files. The site is a Managed WordPress site and it’s hard to get access to editing . Is there any other fix or is this it?
Thanks!
Erin

I added to my htaccess file and I’m still not seeing social icons. Also, the arrow button for the page scroll up feature is also a square. I tried adding it after #End WordPress and it broke my site. This is what I have:
# BEGIN GD-SSL
<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{HTTPS} !=on
RewriteCond %{HTTP_USER_AGENT} ^(.+)$
RewriteCond %{SERVER_NAME} ^danieldipalmaphotography\.com$ [OR]
RewriteCond %{SERVER_NAME} ^x83\.a6b\.myftpupload\.com$
RewriteRule .* https://%{SERVER_NAME}%{REQUEST_URI} [R=301,L]
Header add Strict-Transport-Security “max-age=300”
Header always set Content-Security-Policy “upgrade-insecure-requests”
</IfModule>
# END GD-SSL

# BEGIN WordPress
# The directives (lines) between BEGIN WordPress and END WordPress are
# dynamically generated, and should only be modified via WordPress filters.
# Any changes to the directives between these markers will be overwritten.
# END WordPress

Where do I add
<FilesMatch “.(ttf|otf|woff)$”>
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin “*”
</IfModule>
</FilesMatch>

Thanks!

I added the code but I’m still getting a box instead of an icon. I have the LinkedIn social profile in the menu on the homepage and you’ll see it’s not the LinkedIn logo but a box. Also, my scroll up arrows are still boxes. Anything else I can try? https://danieldipalmaphotography.com/

Thanks!