Hello Saber,
This appears to be a of the log templates from one of our Std libraries. The entities in the header are in blocks. To edit them you edit the blocks. If you zoom out, on the left you should 2 block headers, Logo and Title, and Page 1 Header. You'll notice one is red and one is gray. The red entities are in the Logo and Title block, which also is red. The gray entities are in the Page 1 Header block, which is gray. To edit these go to the menu bar, click on Blocks->Edit Log Blocks:
Then, in the big yellow drop-down, select the block you wish to edit:
To enter elevation, go to Input. Select the Borehole (or Point) tab. The field is called Surface Elevation (unless it's been re-captioned). If you do not see this field it may be hidden. To unhide a field, on the menu bar click Tables>Show or Hide Fields. Uncheck the box for Surface Elevation to show it.
If these steps do not match what you are seeing your files may have been customized. If so, or you would like me to walk you through these changes please contact me at kathleen.holcombATbentley.com.