This reading is available from several sources. You can find various editions in the library. Choose a more recent translation if you have a choice.
On campus or via GU-Express you can access it on the web from PastMasters. Go to http://library.nlx.com/, choose "Plato", select the "Edith Hamilton and Huntington Cairns Edition" and then choose "Lysis". Here is a convenient link that might take you all the way to the text (but this link may have expired by the time you already got to it).
The Perseus Project also has it, but you need to page through it paragraph by paragraph. You can access this version off-campus from a non-Georgetown connection, and it has nice footnotes.