To change the menu, have you had a look for it in Admin page > Appearance > Menus.
If its not there, changing code can be tricky if you are not used to it. A simpler way is to hide the unwanted link. This can be achieved with some custom css:
li#menu-item-334 {display: none}
Your theme may have an option to enter custom css. If so, it will be in Admin page > Appearance > Theme options or Admin page > Appearance > Customise. If not, you can use the Simple Custom CSS plugin or similar.
To change the logo, again it may be easier to change the image file rather than change the code.
Method one, if you can find the logo in the media library (the file is called default-logo.png) then you can replace the image. Replacing images is not possible with the standard WordPress but the Enable Media Replace plugin will enable you to do it. Make sure your new logo has the same filename.
Method two is to replace the image file with your new logo at:
/wp-content/themes/vaengineering/images/default-logo.png
using FTP or your host’s file manager software.
