However since you say you are a beginner, I would suggest the following links to get you past the smaller hurdles in learning Access. Great tutorials and examples to get through the basic learning curve.
I noticed right away that your textbox was controlled by an undefined function =FirstDayOfMonth() (I did verify that there was no VB Code in a module first).
When I changed the value to =Month(Now()) the field contained Jan
When I changed the value to =Now() the field contained Aug
I checked the properties of the field and found the format to be set to "mmm", so I changed the format to short date.
When I changed the value to =Month(Now()) the field contained 1/7/1900
When I changed the value to =Now() the field contained 8/28/2008
I removed the format entirely, and and the following was displayed.
When I changed the value to =Month(Now()) the field contained 8
When I changed the value to =Now() the field contained 8/28/2008 11:35:10 AM
I next tried the function MonthName
When I changed the value to =MonthName(Month(Now()),True) the field contained Aug
When I changed the value to =MonthName(Month(Now()),False) the field contained August
Somewhere in these tests, I hope that there is something that you can use.
However since you say you are a beginner, I would suggest the following links to get you past the smaller hurdles in learning Access. Great tutorials and examples to get through the basic learning curve.