You can start the Record Activity either from the Home View or from the List View. Lets try the Home View first :

The 'eye' icon in the above image is what you click to start the Record Activity. Note : the icon might not be in the same place as you see here. If you do not see the icon at all then we should go to the List View. To do this click on the icon that looks like five parallel lines at the top right of the Home View :

This will take you to a list of activities :

You should scroll down the list until you see the Record Activity. You can then do one of two things. You can click on the star to the left. This will add the Record Activity to the Home View and then you can return to the Home View by clicking the Home View icon :

You would then start the activity in the way described above. However, if you do not wish to add Record to the Home View then just click on the eye icon in the List View and Record wil start immediately (it takes a little time to start up).