Part of the space is due to your editor adding a description to your Profile Picture tab within Tab Management. Some editors will add a tag such as paragraph or linebreak automatically, then when you save your tab you end up with that tag as the description. Please examine the tab and review the source of the description, selecting all (CTRL+A) and deleting, then save.

[code:1]
<div id="cbPortraitDescription" class="tab_Description"><p><br mce_bogus="1"></p></div>
[/code:1]

Your tabs description is as follows.

[code:1]
<p><br mce_bogus="1"></p>
[/code:1]

Then your template is adding a lot of padding, please see CSS as follows.

IN: portal/templates/rt_affinity_j15/css/template.css
ON: Line 100
[code:1]
.mainbody-surround {
margin-top:4px; <-- added margin adds even more space
overflow:hidden;
padding:15px; <-- large amount of padding
position:relative;
}
[/code:1]

Examine your editors parameters from Joomla plugins or if it has a component panel then examine its configuration. It's possible that addition of code is simply a setting that can be turned off. Just turn each ON then test then OFF then test then back to what it was previously if issue doesn't resolve.