You need to add the field "time tracking" to the create and/or edit screen for the tasks, and make sure it is not hidden in the field configuration (check the project administration screen to find the "field configuration scheme" in use, and the "issue type screen scheme to drill down to the screens in use)
There's several places you need to check. 1. Have you got "time tracking" enabled in the general configuration? 2. Have you identified the *screen* that is in use for "create issue" and edited that? 3. Have you checked the field configuration setup? (It must not say "hidden" next to timetracking) You might want a go through https://confluence.atlassian.com/display/JIRA/Configuring+Fields+and+Screens
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