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Assuming you are on Windows using a mainstream browser
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Note that
altrefers to the left alt keyctrlrefers to the left control key
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Part A
- Sequence 1
ctrl left-clickthis link twice (open link in a new tab)
 - Sequence 2
ctrl l(select URL)ctrl c(copy)
 - Sequence 3 (memorize it first)
ctrl tabx2 (go to the tab on the right, twice)ctrl shift tabx2 (go to the tab on the left, twice)- You can repeat it to further get used to it.
 
 - Sequence 4 (memorize it first)
ctrl t(open new tab)ctrl v(paste)enter
 - Sequence 5 (memorize it first)
ctrl shift tab(go to the tab on the left)ctrl l(select URL)ctrl c(copy)ctrl tab(go to the tab on the right)
 - Sequence 6
ctrl l(select URL)ctrl v(paste)esc(quit replacing the URL)
 
 - Sequence 1
 
left-click on this link to go further in part B.