i need to click automatically in exact location!

hello there, yesterday i bought this great app from google store! i need just a function that help me to click on a certain location of my screen; i dont know whats the number of the location in my application! how do i find that and how do i write script for that? i haven't good skills in programming so is there any body to help me through my way?! i need this for my advertising on instagram! i want use instafollow (unofficial app in other language) to gain more followers!
the properties of my function:
click on follow 
and wait for 3 seconds
again click on follow!
repeat it for 1000 times! 






in here i tried to write scripts like the example that was in forum guidance:

the calc was:



-------------

-- ========== Settings ================

Settings:setCompareDimension(true, 960)

Settings:setScriptDimension(true, 960)

Settings:set("MinSimilarity", 0.65)

right = Region(400, 0, 560, 640)

-- ========== main program ===========

right:highlight()

wait(3)

click("6.png")

click("+.png")

click("9.png")

setHighlightStyle(0x8fffff00, true)

getLastMatch():highlight(3)

click("-.png")

click("7.png")

click("=.png")

print("Hello World!")

right:highlight()

----------------

-- ========== Settings ================

Settings:setCompareDimension(true, 960)

Settings:setScriptDimension(true, 960)

Settings:set("MinSimilarity", 0.65)



-- ========== main program ===========

wait(3)

click("6.png")

click("+.png")

click("9.png")

click("-.png")

click("7.png")

click("=.png")

print("Hello World!")

+++++++++++++++++++++++++++++++

and mine:

-- ========== Settings ================

Settings:setCompareDimension(true, 960)

Settings:setScriptDimension(true, 960)

Settings:set("MinSimilarity", 0.65)



-- ========== main program ===========

wait(3)

click("follow.png")

wait(3)

click("follow.png")

wait(3)

click("follow.png")

wait(3)

click("follow.png")

wait(3)

click("follow.png")

wait(3)

click("follow.png")

wait(3)

print("time is up!")



---------------------- ========== Settings ================

Settings:setCompareDimension(true, 960)

Settings:setScriptDimension(true, 960)

Settings:set("MinSimilarity", 0.65)

right = Region(400, 0, 560, 640)

-- ========== main program ===========

right:highlight()

wait(3)

click("follow.png")

wait(3)

click("follow.png")

wait(3)

click("follow.png")

setHighlightStyle(0x8fffff00, true)

getLastMatch():highlight(3)

wait(3)

click("follow.png")

wait(3)

click("follow.png")

wait(3)

click("follow.png")

wait(3)

print("time is up!")

right:highlight()



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and an other question: is it difference to use scripts in other phones that i used it for galaxy note 5? like i want to use the same script on sony arc S!

please help me in my way. thanks