How to add a description on the opportunity through the Sugar CRM app?

Could you specify what do you mean by interaction history you need to add? log Call/Meeting held or add new Note in the context of Account?

Could you specify what do you mean by interaction history you need to add? log Call/Meeting held or add new Note in the context of Account?

I just need to put a note in that field where "description" is written.

I know how to add a interaction history about call/ Meeting ir note...  but none of these options goes into the field where "description" is written.