Here's a breakdown:
* Spell (present tense): I spell, you spell, he/she/it spells, etc.
* Spelled (past tense): I spelled, you spelled, he/she/it spelled, etc.
* Spelled (past participle): I have spelled, you have spelled, he/she/it has spelled, etc.
"Spelled" is used in both the past tense and the past participle.