Questions

[WingedDog]

1) In game: F5 -> Left click on "Enchantment" -> "F" key

2) Grey color means your mage doesn't have the requirements to cast the spell. In this case he is E2, while spell requires E3. But if mage is 1 level below required and spell costs no more then 1 gem - extra equipped gem allows you to cast spell. So short answer is yes - he will cast Blade Wind if is equiped with gem(s).

3) Not only different computers do not affect your turn - you can submit it from different e-mails.