Here Is a small guide in Disqus-formatting, that I have ‘published’ several times on the old GSMArena.com blog (with tiny variation).
UPDATE: Should in 2019 finally be more or less obsolete for wide enough windows!
See the guide in the disqus-comment below
UPDATE 2019-01-13: Just noticed that Disqus have finally added a formatting bar!
Here from a PC:
Note that on phones & phablets only some of the options are available when the display is in Portrait mode
All are available with the display in Landscape though:
The width needed for the full set of icons will vary depending on platform and font size of course.
In Firefox at this site, all scaling 100%, It requires an outer window width of 874 to show all icons
Note how the icons creeps into the “Post as ….” (depending on the name-length), but are still active, as can be seen by the mouse over text (and light button colour) where the mouse was at the right part of “Post”.
I wonder how long the new bar has been there, without me noticing it??