Hello!
Please, what means the expression “overloaded” in that context:
And what particularly means: “member”? (here)
Many thanks!
What does this have to do with LibreOffice? We are not any Microsoft support. Please give us more context!
That are technical terms from object oriented programming (OOP). Search for ‘overloading’ and ‘member’ with the additional search item ‘OOP’, or get a textbook about OOP.
When MSO doesn’t work people come quickly to LibO, the better alternative!
A nice one 
It is highly likely they really meant that the function can have different meanings depending on the (types of the) arguments you provide. It is also called having “optional arguments”.
Also, what @dennis-roczek said.