Help with SavedVariables

[Wolfind]

hello everyone, I'm new in this fantastic world, I begin to apologize for my bad English (not English). I hope you can make me clarity on the global variables...I've read various things but I did not understand very well . I created this little addon for fun, I'd like a button that saves the text in the editbox and the other button sends message with text saved even after reload or relog. Thanks for the help!

My .toc:

## Title: SaveVar
## Version: 1.0
## Author: Prova
## Interface: 50300

Frame.xml

My .lua:

local SaveMex

function Save_OnClick()
	SaveMex=EdTex:GetText();
end

function Send_OnClick()
	SendChatMessage(SaveMex, "SAY");
end

My .xml:

<Ui xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.blizzard.com/wow/ui/">
	<Script file="Frame.lua" />
	<Frame name="Frame1" parent="UIParent" toplevel="true" movable="true" enableMouse="true">
		<Size x="200" y="200" />
		<Anchors>
			<Anchor point="CENTER" />
		</Anchors>
		<Backdrop bgFile="Interface\DialogFrame\UI-DialogBox-Background" edgeFile="Interface\DialogFrame\UI-DialogBox-Border" tile="true">
			<BackgroundInsets>
				<AbsInset left="11" right="12" top="12" bottom="11" />
			</BackgroundInsets>
			<TileSize>
				<AbsValue val="32" />
			</TileSize>
			<EdgeSize>
				<AbsValue val="32" />
			</EdgeSize>
		</Backdrop>
		<Frames>
			<EditBox name="EdTex" inherits="InputBoxTemplate" enableKeyboard="true" autoFocus="false">
				<Size x="100" y="32" />
				<Anchors>
					<Anchor point="TOPLEFT">
						<Offset x="45" y="-48" />
					</Anchor>
				</Anchors>
			</EditBox>
			<Button name="Send" inherits="UIPanelButtonTemplate" enableMouse="true" text="Send">
				<Size x="75" y="23" />
				<Anchors>
					<Anchor point="TOPLEFT">
						<Offset x="108" y="-118" />
					</Anchor>
				</Anchors>
				<Scripts>
					<OnClick>
						Send_OnClick()
					</OnClick>
				</Scripts>
			</Button>
			<Button name="Save" inherits="UIPanelButtonTemplate" text="Save">
				<Size x="75" y="23" />
				<Anchors>
					<Anchor point="TOPLEFT">
						<Offset x="23" y="-118" />
					</Anchor>
				</Anchors>
				<Scripts>
					<OnClick>
						Save_OnClick()
					</OnClick>
				</Scripts>
			</Button>
		</Frames>
		<Scripts>
			<OnLoad>
				self:RegisterForDrag("LeftButton");
			</OnLoad>
			<OnDragStart>
				self:StartMoving();
			</OnDragStart>
			<OnDragStop>
				self:StopMovingOrSizing();
			</OnDragStop>
		</Scripts>
	</Frame>
</Ui>