Hello Nufaman,
In the admin panel click on the main section called 'Links'.
and all the links will then show, you'll note that by default it reads 'Yes under the heading 'Visible'.
Next, click the check box to enter a tick (Check mark) into any link you want to adjust.
Next, hover over the right hand side of each link and you will note that the option to 'Edit/Delete' becomes visible.. Click on 'Edit'.
And on the next page you'll notice on the far right hand side is another Check Box with 'Keep this link private ' written next to it..
Enter a tick (Check mark) here.
Next, Click on the 'Update Link' button..
Repeat this operation for each 'Blogroll' link you wish to make invisible..
No Code has be altered during this operation
Hope that Helps