errr.... Yes. Wot he said!
So, when you want to change it, you find the previously used word/s such as 'your post' which I've embolded below, and change it.
[U.R.L="http://www.pprune.org/computer-internet-issues-troubleshooting/445817-renaming-hyperlinks-help.html#post6309637"]
Your post[/U.R.L]
Which would result in:
[U.R.L="http://www.pprune.org/computer-internet-issues-troubleshooting/445817-renaming-hyperlinks-help.html#post6309637"]
CHANGED PHRASE[/U.R.L]
Voila again....
CHANGED PHRASE