Yes, you can create a free space page to keep your notes on. Put your pointer on add at the right top of your profile and click Add New Thing.
Profiles of Places and Things
Free-Space Profiles are wiki pages for supplementing family history. They're "anything pages" — free space for genealogy.
For example, you can create a profile for a pet, a house, event, school, or family heirloom. They can also be used for organizing your research, e.g. To-Do Lists, or for collaboration, e.g. Free-Space Projects.
Here are two examples of Free-Space Profiles:
The above can be viewed by anyone, but these profiles can also be kept private just for the family members and friends you designate on the profile's Trusted List.
Creating Free-Space Profiles
Simply use this form to start a profile. This is accessible from the "New Thing" link on the "Add" pull-down menu in the upper-right corner for members. Click here for the Help Pages for a Free Space Page/Profile.