Can't click or tab into a field
If you cannot enter data in a field, consider the following possibilities:
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You could be in Layout or Preview mode. To enter data, switch to Browse mode.
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The field could be a merge field. To enter data, choose a different layout from the Layout pop-up menu.
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The field could be formatted to prohibit entry. If your access privileges allow, in Layout mode, select the field and choose Format menu > Field Format. Make sure Allow entry into field is selected.
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Allow creation of related records is deselected in the relationship definition.
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The file containing the related data has been moved or renamed, or you don't have access to it. In Layout mode, the field displays <File Missing>.
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You can't tab into fields that are not in the tab order; click instead, or add the field to the tab order.
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The field could be a global field or summary field (no data can be entered in Find mode).
Related topics 
Alerts when entering data
Setting the tab order for data entry