You can plan future costs in the PLAN tab :
Set up the initial filters to show the planned work
Add a new planned work
Log a work against an issue
Table overview of planned time
Delete or edit the planned work
You can add a worklog by selecting an issue , specifying the time spent, the start date and adding a comment explaining the work done.
For the planification part, you can plan a future work by filling the following informations :
User, mandatory
Project , mandatory
Category , not mandatory
Component , not mandatory
Version, not mandatory
Issue, mandatory
Description, not mandatory
Scheduled time, mandatory
Time planned, mandatory