You can plug up your 2012 iMac when you are finished using it. Nothing will happen to the iMac. After the iMac is fully charged, make sure to unplug it.
You cannot text from a cell phone that is not charged.You can text to a cell phone that is not charged; however, the recipient will not be able to receive the text until the phone is charged.
To change the color of the text in a presentation on an iMac, open your presentation in Keynote or another presentation software. Select the text box containing the text you want to change, then go to the Format panel on the right. Click on the "Text" tab, and you will find the text color options; choose your desired color from the palette or custom color options. The changes will apply immediately to the selected text.
Yes, you are charged for text message even if you do not open them up. If you do not have a plan for text messaging, you need to let people know not to text you.
You will be charged if you text anyone.
Yes, without a text plan, you will be charged for text messages individually.
Yes, you usually get charged for receiving it
Nobody should get charged for receiving a text. The sender either pays the charge or it's included in their monthly allowance.
TextEdit is located in your Applications folder. Open Applications and it is located there. You can also access it from Finder.
Yes you can
No, you can only get that discount on a new iMac not a refurbished iMac.
There is no "iMac Air".