To search the contents of memos, select Memos > Search in Memos and enter the word(s) you are looking for on the left side of the appearing window.

After clicking on Run search, the Memo Manager opens and lists the memos for which one or more words were found in the memo texts.

A click on a line in the left window or a click on a memo in the right list opens the respective memo, highlighting the search hits in the memo.