You can use the Edit Data window to search for, change and delete data. Select Edit->Edit Data from the main menu.
You can search for and display records occurring between 2 times (select All for all times), optionally with specific text.

When searching for text, use '*' as a wildcard. A '*' matches 0 or more characters and can appear multiple times in a pattern.
To delete records, select the records to be deleted and press delete. To change selected records, click Change and select the correct activity.