NOTE: The method for doing this in Football Manager 2015 is exactly the same as for FM2014.
If you are wanting to change the logos on the Overview Screen to kits then you want to follow the instructions on this page: FM2015 Match Screen Kits Mod
These instructions will assume you have already downloaded and installed the version of the Highlights mod you want to edit.
To download the mod see this page
If you are using the view with the teams arranged vertically (the default view for the left and middle panels) you'll need to edit the 'match incidents small.xml' file.
If you are using the view with the teams arranged horizontally (default view for the bottom right panel) you'll need to edit the 'match incidents overview small.xml' file.
Both of these files will need to be extracted from the panels.fmf file that is installed with the game, if you do not know how to do this then read this guide: FM2015 Guide: How to Extract Default Files & Understand File Structure
If you are using the custom view made for this mod that adds the shirts to the view that arranges the team names horizontally then you'll need to edit the 'match incidents shirts.xml' file
The coding that we need to look at is largely the same regardless of which file you are editing (just the values change), the coding below is from the 'match incidents small'l file.
The first line you need to locate is this one near the top of the file:
<widget class="table" id="tntb" layout="100,-60,-15" mode="fill_rows, stripe_rows" auto_size_rows="true" stretch_to_fit_rows="true" row_spacing="0">
The 100 is for the kit/logo picture, -60 is for the team name and -15 is for the score, the only one that should need adjusting is the first number, make this number 10 or 20 pixels greater than the size of the kit/logo. You should only need to play around with the other numbers if you don't have enough room.
If you want to adjust the text size locate this bit of code:
<list id="column_properties">
<record index="0" auto_size="all" />
<record index="1" size="18" alignment="left,centre_y" />
<record index="2" alignment="right,centre_y" size="18" />
</list>
The second line sets the font size for the Team Name and the third line sets the font size for the Score.
Now to adjust the kit/logo size locate this bit of code:
<!-- stick the icon widget here -->
<container height="80" width="80" col="0" row="0">
And adjust the values to match your kit size.
Finally if you are editing the font size locate this bit of code:
<widget class="text" id="mitn" col="1" row="0" height="80" font="fonts/match_panel_title" />
And adjust the value if need be, you should only need to do this if your font isn't fitting.