Since "installing" bookmarklet in the mobile version of Safari isn't as easy as in the original this guide should be of help.
Bookmark this page by hitting the + on the bottom of your screen. Later this will be the bookmark to use the in page search.
Tap the following textfield once to focus it and a second time so the Select all-bubble appears. Hit it! Then hit the Copy-button in the next bubble that appears.
Go to your bookmarks and hit the Edit-button on the bottom left. Tap the bookmark you just created for this page.
Tap the second field that contains the URL and clear it by hitting the X on the right. Tap the field again so the Paste-bubble appears. And paste you shall.
Hit the blue Done-button on the bottom right. That's it. :)