Make your list using Rich Text widget, go to Page Settings and click on "Additional CSS" button:

2. Then, please copy and paste the code below in the opened CSS window:

@import url("https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css");
font-family: 'FontAwesome';
ul {
list-style: none;
padding: 0;
}
li {
padding-left: 1.3em;
}
li:before {
content: "\f14a"; /* FontAwesome Unicode */
font-family: FontAwesome;
display: inline-block;
margin-left: -1.3em; /* same as padding-left set on li */
width: 1.3em; /* same as padding-left set on li */
}

Click on "Save".

Now you'll have Tickboxes instead of Bullet points.

If you want to have other characters:

go to https://fontawesome.com/
click on 'Icons' option

select the character you want to have and copy its Unicode (e.g. f042)

Change the existing unicode with yours (line 13):

click on "Save" and you'll see the desired characters:

You can also have the desired characters for the whole project

Go to project settings

Open "Styles" tab and paste the code, click on "Save"

That's it! Now all the pages in your project will have these characters.

Checkout our video tutorial as well:
https://www.youtube.com/watch?v=SxOX50rHL40&feature=youtu.be