Sign in to your Morningscore account
Select the Keywords section and check whether you are in the Rank Tracker
Click on the three dots in the list of all keywords in the column actions
Here you have various options (see below) where you select keyword history
Change the date range in the top right corner if you want to look at a different time period

Options for individual keywords
View all ranks
Keyword history
Search on Google
Add to folder
Add to favourites list
Delete keyword

Keyword Rank Tracker Actions

Please note:
If you are interested in the general changes of your keywords and Google rankings instead, also have a look at this article.