In order to enter conjugation forms, make sure the conjugation forms tool is enabled. You open it with the menu: → .
First select a word that is a verb.
Click the ... is a Verb button in the conjugations tool.
After selecting the right tense in the tense selection box, enter the conjugation forms.
The tenses can be configured for each language: Languages and Grammar.
Now you can use the Conjugations Practice mode.