Okay, your iphone browser is called Safari. There is an address bar, though it is possible to hide it. Maybe you're just not seeing it?
No matter where you are in a web page in Safari on the iPhone itís really simple to get straight back to the address bar.
All you need do is tap the menu bar across the top of the screen where the time is located. iPhone will quickly jump straight back to the top of any web page and show you the address bar. This is also a great way to quickly get back to the top of a page and not just back to the address bar.
and my brother said
tap in the address field and the address bar goes to full screen width with the Web page dimmed. Tap in the address field again and you should get a set of options on screen:
Select, Select All, Paste.
Choose Select All by tapping on it. The options then change to:
Cut, Copy, Paste.
Choose Copy. Then go to where the address is needed and tap there. That brings up the Paste option. Tap that.
.. could try reading the manual. It'll be near the bottom of Safari's Bookmarks list and will be called iPhone User Manual.
(I paraphrased a bit towards the end there).