cant get into dashboard after adding plugin

hallo

i added a plugin for fonts ( beta version) called WPFontsForWebwebfontsplugin and i cant login to my dashboard anymore.

this is the error message i get wen trying to login

Fatal error: Cannot redeclare mycustomstyles() (previously declared in /var/www/vhosts/drivelikeaitalian.org/httpdocs/wp-content/plugins/font/Font.php:170) in /var/www/vhosts/drivelikeaitalian.org/httpdocs/wp-content/plugins/fontsforwebcom-webfonts-plugin/WPFontsForWebwebfontsplugin.php on line 126

i can see my site ok. Also the plugin didnt instal i just got this message at that time as well.

https://www.drivelikeaitalian.org/

lisa