Take another look at the sentence:
Melody put her head on the desk. Thus, you need a form of lay. Since the sentence is past tense, you need the simple past form. Consult the table below or review the rules.
Notice that the form you wanted to use, layed, does not exist on the table. The reason is that layed is a spelling error.
|Infinitive||Definition||Simple Present||Simple Past||Past Participle||Present Participle|
|to lay||to put something down||lay(s)||laid||laid||laying|
|to lie||to rest or recline||lie(s)||lay||lain||lying|