Hi Jacob,
Watch tutorial in this below page to create a filter in the Universe (IDT), you'll see that we'll be writing the condition directly in the Where clause and yes you should be pasting the filter text we gave you earlier.
Information design tool 4.0: Create a pre-defined native filter
Update:
Create a filter called MTD & Last 2 Months with the below text in Where clause:
@SELECT(FOLDERNAME/DATEOBJECTNAME) BETWEEN TRUNC (ADD_MONTHS (SYSDATE,-2),'MM')ANDSYSDATE
In the above text, please replace FOLDERNAME/DATEOBJECTNAME with by selecting the Date object you have.
Also, these are the Official tutorials for Information Design Tool (IDT):
Official Product Tutorials – SAP BusinessObjects Information Design Tool
Thanks,
Mahboob Mohammed