Change appearance of lower right info boxes in topics and posts

@bdebruin,

In this  case, you need to use the following code: 

.wpfcp-article-info a {
   color:white
   font-size: 15px;
}

Hi @Astghik

Many thanks, that did it! One final question: why do some CSS modifications need to go the them>customize>additional CSS and other go into wpforo>setting>style>additional CSS

I want to keep all modifications together.

@bdebruin,

as wpForo doesn't load on the current page (it is simple WordPress post) you need to add the code in Black Admin Bar > Customize > Additional CSS textarea.
All CSS codes that are changing wpForo appearance should be added in Dashboard > Forums > Setting > Style > "Custom CSS code" textarea. 

As about me, I regrouped all CSS customizations only in the main Customize. Or else I would lost their count, custom code for wpforo here, custom code for wpdiscuz there, custom code for peepso elsewhere, other custom code in admin customization. Not to mention that sometimes they get reseted and lost with some upgrades (like WP 5.0 did for my wpDiscuz). It works very well from one sole place. They will be all loaded, however, for every page, not only the forum page. A trade-off of some additional dozen kilobytes to load.